This research was aimed at determining the influence of principal managerial competency toward organizational citizenship behavior (OCB) and teachers' productivity by mediation of interpersonal communication in State Vocational High School (SMK) South Tapanuli, North Sumatera. This research was mix research. Instruments were questionaire, interview and observation. 170 teachers in State Vocational High School (SMK) South Tapanuli with civil servant status were being respondents. The sampling technique using simple random sampling and analysis techniques using Structural Equation Modelling (SEM) with AMOS program assistance. The findings showed that principal managerial competency has positive and significant effect on the organizational citizenship behavior (OCB), principal managerial competency has positive and significant effect on the teacher productivity, principal managerial competency has positive and significant effect on interpersonal communication. Interpersonal communication has positive but not significant effect on organizational citizenship behavior (OCB), interpersonal communication has positive but not significant effect on teachers productivity.
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Fitriani Harahap (2017) studied this question.